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3 x (104 x 2 - 12 x 7) + 53,,, 3 x 104 - (12 x 7 + 53),,, 3 x (104 - 12) x (7+53)

Răspuns :

a) 3×(104×2-12×7)+53

=3×(208-84)+53=

=3×124+53=

=372+53=

=425

b) 3×104-(12×7+53)=

=312-(84+53)=

=312-137

=175

c) 3×(104-12)×(7+53)=

=3×92×60=

=276×60=

=16.560